Datasheet ADP7157 (Analog Devices) - 9

Data Sheet ADP7157 1.25 14 ILOAD = 0mA 13 1.24 ILOAD = 10mA ILOAD = 100mA 12 ILOAD = 600mA 1.23 ILOAD = 1200mA 11 1.22 10 I 9 LOAD = 1200mA 1.21 8 (V) mA) ILOAD = 600mA 1.20 ( UT 7 O ND V 6 1.19 I G ILOAD = 100mA 5 1.18 4 ILOAD = 10mA 1.17 3 ILOAD = 0mA 2 1.16 1 1.15 0 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
017
2.3 2.6 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5 5.3 5.6
020
VIN (V) V
12938-
IN (V)
12938- Figure 17. Output Voltage (VOUT) vs. Input Voltage (VIN) Figure 20. Ground Current (IGND) vs. Input Voltage (VIN) at Various Loads, VOUT = 1.2 V at Various Loads, VOUT = 1.2 V
14 0 ILOAD = 10mA 13 I –10 LOAD = 100mA I 12 LOAD = 600mA ILOAD = 1200mA 11 –20 10 –30 9 I –40 8 LOAD = 1200mA B) mA) d ( 7 –50 ND ILOAD = 600mA RR ( 6 S I G P –60 5 ILOAD = 100mA 4 –70 3 ILOAD = 10mA –80 I 2 LOAD = 0mA –90 1 0 –100 –40 –20 0 20 40 60 80 100 120 140
018
1 10 100 1k 10k 100k 1M 10M
021
TEMPERATURE (°C)
12938-
FREQUENCY (Hz)
12938- Figure 18. Ground Current (IGND) vs. Temperature Figure 21. Power Supply Rejection Ratio (PSRR) vs. Frequency at Various Loads, VOUT = 1.2 V at Various Loads, VOUT = 3.3 V
14 0 900mV 13 800mV –10 700mV 12 600mV 11 –20 500mV 10 –30 9 –40 8 B) d mA) ( 7 –50 ND RR ( 6 S I G P –60 5 4 –70 3 –80 2 –90 1 0 –100 0.1m 1m 10m 100m 1 10 1 10 100 1k 10k 100k 1M 10M
022 019
I FREQUENCY (Hz) LOAD (A)
12938- 12938- Figure 19. Ground Current (I Figure 22. Power Supply Rejection Ratio (PSRR) vs. Frequency GND) vs. Load Current (ILOAD), VOUT = 1.2 V at Various Headroom Voltages, VOUT = 3.3 V, 1.2 A Load Rev. B | Page 9 of 23 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL DATA THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL CAPACITOR SELECTION Output Capacitor Input and VREG Capacitor REF Capacitor BYP Capacitor Capacitor Properties UNDERVOLTAGE LOCKOUT (UVLO) PROGRAMMABLE PRECISION ENABLE START-UP TIME REF, BYP, AND VREG PINS CURRENT-LIMIT AND THERMAL SHUTDOWN THERMAL CONSIDERATIONS Thermal Characterization Parameter (ΨJB) PSRR PERFORMANCE PCB LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE